/*
cppcryptfs : user-mode cryptographic virtual overlay filesystem.

Copyright (C) 2016-2025 Bailey Brown (github.com/bailey27/cppcryptfs)

cppcryptfs is based on the design of gocryptfs (github.com/rfjakob/gocryptfs)

The MIT License (MIT)

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/

#include "pch.h"
#include <wincrypt.h>
#include <wintrust.h>
#include <stdio.h>
#include <tchar.h>
#include <string>
#include "certutil.h"

#pragma comment(lib, "crypt32.lib")

#define ENCODING (X509_ASN_ENCODING | PKCS_7_ASN_ENCODING)

using namespace std;

typedef struct {
    LPWSTR lpszProgramName;
    LPWSTR lpszPublisherLink;
    LPWSTR lpszMoreInfoLink;
} SPROG_PUBLISHERINFO, * PSPROG_PUBLISHERINFO;

static BOOL GetProgAndPublisherInfo(PCMSG_SIGNER_INFO pSignerInfo,
    PSPROG_PUBLISHERINFO Info);
static BOOL GetDateOfTimeStamp(PCMSG_SIGNER_INFO pSignerInfo, SYSTEMTIME* st);
static BOOL GetCertificateInfo(PCCERT_CONTEXT pCertContext, wstring& commond_name);
static BOOL GetTimeStampSignerInfo(PCMSG_SIGNER_INFO pSignerInfo,
    PCMSG_SIGNER_INFO* pCounterSignerInfo);

int GetCommonName(LPCWSTR szFileName, std::wstring& common_name)
{

    HCERTSTORE hStore = NULL;
    HCRYPTMSG hMsg = NULL;
    PCCERT_CONTEXT pCertContext = NULL;
    BOOL fResult;
    DWORD dwEncoding, dwContentType, dwFormatType;
    PCMSG_SIGNER_INFO pSignerInfo = NULL;
    PCMSG_SIGNER_INFO pCounterSignerInfo = NULL;
    DWORD dwSignerInfo;
    CERT_INFO CertInfo;
    SPROG_PUBLISHERINFO ProgPubInfo;
    //SYSTEMTIME st;

    int ret = 0;

    ZeroMemory(&ProgPubInfo, sizeof(ProgPubInfo));
    __try
    {
       
        // Get message handle and store handle from the signed file.
        fResult = CryptQueryObject(CERT_QUERY_OBJECT_FILE,
            szFileName,
            CERT_QUERY_CONTENT_FLAG_PKCS7_SIGNED_EMBED,
            CERT_QUERY_FORMAT_FLAG_BINARY,
            0,
            &dwEncoding,
            &dwContentType,
            &dwFormatType,
            &hStore,
            &hMsg,
            NULL);
        if (!fResult)
        {
            //_tprintf(_T("CryptQueryObject failed with %x\n"), GetLastError());
            ret = -1;
            __leave;
        }

        // Get signer information size.
        fResult = CryptMsgGetParam(hMsg,
            CMSG_SIGNER_INFO_PARAM,
            0,
            NULL,
            &dwSignerInfo);
        if (!fResult)
        {
            //_tprintf(_T("CryptMsgGetParam failed with %x\n"), GetLastError());
            ret = -1;
            __leave;
        }

        // Allocate memory for signer information.
        pSignerInfo = (PCMSG_SIGNER_INFO)LocalAlloc(LPTR, dwSignerInfo);
        if (!pSignerInfo)
        {
            //_tprintf(_T("Unable to allocate memory for Signer Info.\n"));
            ret = -1;
            __leave;
        }

        // Get Signer Information.
        fResult = CryptMsgGetParam(hMsg,
            CMSG_SIGNER_INFO_PARAM,
            0,
            (PVOID)pSignerInfo,
            &dwSignerInfo);
        if (!fResult)
        {
            //_tprintf(_T("CryptMsgGetParam failed with %x\n"), GetLastError());
            ret = -1;
            __leave;
        }

        // Get program name and publisher information from 
        // signer info structure.
        if (GetProgAndPublisherInfo(pSignerInfo, &ProgPubInfo))
        {
            if (ProgPubInfo.lpszProgramName != NULL)
            {
                wprintf(L"Program Name : %s\n",
                    ProgPubInfo.lpszProgramName);
            }

            if (ProgPubInfo.lpszPublisherLink != NULL)
            {
                wprintf(L"Publisher Link : %s\n",
                    ProgPubInfo.lpszPublisherLink);
            }

            if (ProgPubInfo.lpszMoreInfoLink != NULL)
            {
                wprintf(L"MoreInfo Link : %s\n",
                    ProgPubInfo.lpszMoreInfoLink);
            }
        }

        //_tprintf(_T("\n"));

        // Search for the signer certificate in the temporary 
        // certificate store.
        CertInfo.Issuer = pSignerInfo->Issuer;
        CertInfo.SerialNumber = pSignerInfo->SerialNumber;

        pCertContext = CertFindCertificateInStore(hStore,
            ENCODING,
            0,
            CERT_FIND_SUBJECT_CERT,
            (PVOID)&CertInfo,
            NULL);
        if (!pCertContext)
        {
            //_tprintf(_T("CertFindCertificateInStore failed with %x\n"),
            //   GetLastError());
            ret = -1;
            __leave;
        }

        // Print Signer certificate information.
        //_tprintf(_T("Signer Certificate:\n\n"));
        GetCertificateInfo(pCertContext, common_name);
        //_tprintf(_T("\n"));

        // Get the timestamp certificate signerinfo structure.
#if 0
        if (GetTimeStampSignerInfo(pSignerInfo, &pCounterSignerInfo))
        {
            // Search for Timestamp certificate in the temporary
            // certificate store.
            CertInfo.Issuer = pCounterSignerInfo->Issuer;
            CertInfo.SerialNumber = pCounterSignerInfo->SerialNumber;

            pCertContext = CertFindCertificateInStore(hStore,
                ENCODING,
                0,
                CERT_FIND_SUBJECT_CERT,
                (PVOID)&CertInfo,
                NULL);
            if (!pCertContext)
            {
                //_tprintf(_T("CertFindCertificateInStore failed with %x\n"),
                //    GetLastError());
                ret = -1;
                __leave;
            }

            // Print timestamp certificate information.
            //_tprintf(_T("TimeStamp Certificate:\n\n"));
            GetCertificateInfo(pCertContext, common_name);
            //_tprintf(_T("\n"));

            // Find Date of timestamp.
            if (GetDateOfTimeStamp(pCounterSignerInfo, &st))
            {
                //_tprintf(_T("Date of TimeStamp : %02d/%02d/%04d %02d:%02d\n"),
                    st.wMonth,
                    st.wDay,
                    st.wYear,
                    st.wHour,
                    st.wMinute);
            }
            //_tprintf(_T("\n"));
        }
#endif
    }
    __finally
    {
        // Clean up.
        if (ProgPubInfo.lpszProgramName != NULL)
            LocalFree(ProgPubInfo.lpszProgramName);
        if (ProgPubInfo.lpszPublisherLink != NULL)
            LocalFree(ProgPubInfo.lpszPublisherLink);
        if (ProgPubInfo.lpszMoreInfoLink != NULL)
            LocalFree(ProgPubInfo.lpszMoreInfoLink);

        if (pSignerInfo != NULL) LocalFree(pSignerInfo);
        if (pCounterSignerInfo != NULL) LocalFree(pCounterSignerInfo);
        if (pCertContext != NULL) CertFreeCertificateContext(pCertContext);
        if (hStore != NULL) CertCloseStore(hStore, 0);
        if (hMsg != NULL) CryptMsgClose(hMsg);
    }
    return common_name.size() > 0 ? ret : -1;
}

BOOL GetCertificateInfo(PCCERT_CONTEXT pCertContext, wstring& common_name)
{
    BOOL fReturn = FALSE;
    LPTSTR szName = NULL;
    DWORD dwData;

    __try
    {
        // Print Serial Number.
        //_tprintf(_T("Serial Number: "));
        dwData = pCertContext->pCertInfo->SerialNumber.cbData;
        for (DWORD n = 0; n < dwData; n++)
        {
            //_tprintf(_T("%02x "),
            //    pCertContext->pCertInfo->SerialNumber.pbData[dwData - (n + 1)]);
        }
        //_tprintf(_T("\n"));

        // Get Issuer name size.
        if (!(dwData = CertGetNameString(pCertContext,
            CERT_NAME_SIMPLE_DISPLAY_TYPE,
            CERT_NAME_ISSUER_FLAG,
            NULL,
            NULL,
            0)))
        {
            //_tprintf(_T("CertGetNameString failed.\n"));
            __leave;
        }

        // Allocate memory for Issuer name.
        szName = (LPTSTR)LocalAlloc(LPTR, dwData * sizeof(TCHAR));
        if (!szName)
        {
            //_tprintf(_T("Unable to allocate memory for issuer name.\n"));
            __leave;
        }

        // Get Issuer name.
        if (!(CertGetNameString(pCertContext,
            CERT_NAME_SIMPLE_DISPLAY_TYPE,
            CERT_NAME_ISSUER_FLAG,
            NULL,
            szName,
            dwData)))
        {
            //_tprintf(_T("CertGetNameString failed.\n"));
            __leave;
        }

        // print Issuer name.
        //_tprintf(_T("Issuer Name: %s\n"), szName);
        LocalFree(szName);
        szName = NULL;

        // Get Subject name size.
        if (!(dwData = CertGetNameString(pCertContext,
            CERT_NAME_SIMPLE_DISPLAY_TYPE,
            0,
            NULL,
            NULL,
            0)))
        {
           // //_tprintf(_T("CertGetNameString failed.\n"));
            __leave;
        }

        // Allocate memory for subject name.
        szName = (LPTSTR)LocalAlloc(LPTR, dwData * sizeof(TCHAR));
        if (!szName)
        {
            //_tprintf(_T("Unable to allocate memory for subject name.\n"));
            __leave;
        }

        // Get subject name.
        if (!(CertGetNameString(pCertContext,
            CERT_NAME_SIMPLE_DISPLAY_TYPE,
            0,
            NULL,
            szName,
            dwData)))
        {
            //_tprintf(_T("CertGetNameString failed.\n"));
            __leave;
        }

        // Print Subject Name.
        //_tprintf(_T("Subject Name: %s\n"), szName);

        common_name = szName;

        fReturn = TRUE;
    }
    __finally
    {
        if (szName != NULL) LocalFree(szName);
    }

    return fReturn;
}

LPWSTR AllocateAndCopyWideString(LPCWSTR inputString)
{
    LPWSTR outputString = NULL;

    outputString = (LPWSTR)LocalAlloc(LPTR,
        (wcslen(inputString) + 1) * sizeof(WCHAR));
    if (outputString != NULL)
    {
        lstrcpyW(outputString, inputString);
    }
    return outputString;
}

BOOL GetProgAndPublisherInfo(PCMSG_SIGNER_INFO pSignerInfo,
    PSPROG_PUBLISHERINFO Info)
{
    BOOL fReturn = FALSE;
    PSPC_SP_OPUS_INFO OpusInfo = NULL;
    DWORD dwData;
    BOOL fResult;

    __try
    {
        // Loop through authenticated attributes and find
        // SPC_SP_OPUS_INFO_OBJID OID.
        for (DWORD n = 0; n < pSignerInfo->AuthAttrs.cAttr; n++)
        {
            if (lstrcmpA(SPC_SP_OPUS_INFO_OBJID,
                pSignerInfo->AuthAttrs.rgAttr[n].pszObjId) == 0)
            {
                // Get Size of SPC_SP_OPUS_INFO structure.
                fResult = CryptDecodeObject(ENCODING,
                    SPC_SP_OPUS_INFO_OBJID,
                    pSignerInfo->AuthAttrs.rgAttr[n].rgValue[0].pbData,
                    pSignerInfo->AuthAttrs.rgAttr[n].rgValue[0].cbData,
                    0,
                    NULL,
                    &dwData);
                if (!fResult)
                {
                    //_tprintf(_T("CryptDecodeObject failed with %x\n"),
                    //    GetLastError());
                    __leave;
                }

                // Allocate memory for SPC_SP_OPUS_INFO structure.
                OpusInfo = (PSPC_SP_OPUS_INFO)LocalAlloc(LPTR, dwData);
                if (!OpusInfo)
                {
                    //_tprintf(_T("Unable to allocate memory for Publisher Info.\n"));
                    __leave;
                }

                // Decode and get SPC_SP_OPUS_INFO structure.
                fResult = CryptDecodeObject(ENCODING,
                    SPC_SP_OPUS_INFO_OBJID,
                    pSignerInfo->AuthAttrs.rgAttr[n].rgValue[0].pbData,
                    pSignerInfo->AuthAttrs.rgAttr[n].rgValue[0].cbData,
                    0,
                    OpusInfo,
                    &dwData);
                if (!fResult)
                {
                    //_tprintf(_T("CryptDecodeObject failed with %x\n"),
                    //    GetLastError());
                    __leave;
                }

                // Fill in Program Name if present.
                if (OpusInfo->pwszProgramName)
                {
                    Info->lpszProgramName =
                        AllocateAndCopyWideString(OpusInfo->pwszProgramName);
                } else
                    Info->lpszProgramName = NULL;

                // Fill in Publisher Information if present.
                if (OpusInfo->pPublisherInfo)
                {

                    switch (OpusInfo->pPublisherInfo->dwLinkChoice)
                    {
                    case SPC_URL_LINK_CHOICE:
                        Info->lpszPublisherLink =
                            AllocateAndCopyWideString(OpusInfo->pPublisherInfo->pwszUrl);
                        break;

                    case SPC_FILE_LINK_CHOICE:
                        Info->lpszPublisherLink =
                            AllocateAndCopyWideString(OpusInfo->pPublisherInfo->pwszFile);
                        break;

                    default:
                        Info->lpszPublisherLink = NULL;
                        break;
                    }
                } else
                {
                    Info->lpszPublisherLink = NULL;
                }

                // Fill in More Info if present.
                if (OpusInfo->pMoreInfo)
                {
                    switch (OpusInfo->pMoreInfo->dwLinkChoice)
                    {
                    case SPC_URL_LINK_CHOICE:
                        Info->lpszMoreInfoLink =
                            AllocateAndCopyWideString(OpusInfo->pMoreInfo->pwszUrl);
                        break;

                    case SPC_FILE_LINK_CHOICE:
                        Info->lpszMoreInfoLink =
                            AllocateAndCopyWideString(OpusInfo->pMoreInfo->pwszFile);
                        break;

                    default:
                        Info->lpszMoreInfoLink = NULL;
                        break;
                    }
                } else
                {
                    Info->lpszMoreInfoLink = NULL;
                }

                fReturn = TRUE;

                break; // Break from for loop.
            } // lstrcmp SPC_SP_OPUS_INFO_OBJID                 
        } // for 
    }
    __finally
    {
        if (OpusInfo != NULL) LocalFree(OpusInfo);
    }

    return fReturn;
}

BOOL GetDateOfTimeStamp(PCMSG_SIGNER_INFO pSignerInfo, SYSTEMTIME* st)
{
    BOOL fResult;
    FILETIME lft, ft;
    DWORD dwData;
    BOOL fReturn = FALSE;

    // Loop through authenticated attributes and find
    // szOID_RSA_signingTime OID.
    for (DWORD n = 0; n < pSignerInfo->AuthAttrs.cAttr; n++)
    {
        if (lstrcmpA(szOID_RSA_signingTime,
            pSignerInfo->AuthAttrs.rgAttr[n].pszObjId) == 0)
        {
            // Decode and get FILETIME structure.
            dwData = sizeof(ft);
            fResult = CryptDecodeObject(ENCODING,
                szOID_RSA_signingTime,
                pSignerInfo->AuthAttrs.rgAttr[n].rgValue[0].pbData,
                pSignerInfo->AuthAttrs.rgAttr[n].rgValue[0].cbData,
                0,
                (PVOID)&ft,
                &dwData);
            if (!fResult)
            {
                //_tprintf(_T("CryptDecodeObject failed with %x\n"),
                //    GetLastError());
                break;
            }

            // Convert to local time.
            FileTimeToLocalFileTime(&ft, &lft);
            FileTimeToSystemTime(&lft, st);

            fReturn = TRUE;

            break; // Break from for loop.

        } //lstrcmp szOID_RSA_signingTime
    } // for 

    return fReturn;
}

BOOL GetTimeStampSignerInfo(PCMSG_SIGNER_INFO pSignerInfo, PCMSG_SIGNER_INFO* pCounterSignerInfo)
{
    PCCERT_CONTEXT pCertContext = NULL;
    BOOL fReturn = FALSE;
    BOOL fResult;
    DWORD dwSize;

    __try
    {
        *pCounterSignerInfo = NULL;

        // Loop through unathenticated attributes for
        // szOID_RSA_counterSign OID.
        for (DWORD n = 0; n < pSignerInfo->UnauthAttrs.cAttr; n++)
        {
            if (lstrcmpA(pSignerInfo->UnauthAttrs.rgAttr[n].pszObjId,
                szOID_RSA_counterSign) == 0)
            {
                // Get size of CMSG_SIGNER_INFO structure.
                fResult = CryptDecodeObject(ENCODING,
                    PKCS7_SIGNER_INFO,
                    pSignerInfo->UnauthAttrs.rgAttr[n].rgValue[0].pbData,
                    pSignerInfo->UnauthAttrs.rgAttr[n].rgValue[0].cbData,
                    0,
                    NULL,
                    &dwSize);
                if (!fResult)
                {
                    //_tprintf(_T("CryptDecodeObject failed with %x\n"),
                    //    GetLastError());
                    __leave;
                }

                // Allocate memory for CMSG_SIGNER_INFO.
                *pCounterSignerInfo = (PCMSG_SIGNER_INFO)LocalAlloc(LPTR, dwSize);
                if (!*pCounterSignerInfo)
                {
                    //_tprintf(_T("Unable to allocate memory for timestamp info.\n"));
                    __leave;
                }

                // Decode and get CMSG_SIGNER_INFO structure
                // for timestamp certificate.
                fResult = CryptDecodeObject(ENCODING,
                    PKCS7_SIGNER_INFO,
                    pSignerInfo->UnauthAttrs.rgAttr[n].rgValue[0].pbData,
                    pSignerInfo->UnauthAttrs.rgAttr[n].rgValue[0].cbData,
                    0,
                    (PVOID)*pCounterSignerInfo,
                    &dwSize);
                if (!fResult)
                {
                    //_tprintf(_T("CryptDecodeObject failed with %x\n"),
                    //    GetLastError());
                    __leave;
                }

                fReturn = TRUE;

                break; // Break from for loop.
            }
        }
    }
    __finally
    {
        // Clean up.
        if (pCertContext != NULL) CertFreeCertificateContext(pCertContext);
    }

    return fReturn;
}